Apache Reverse Proxy Issue with SAP SRM

I am in the process of implementing SRM portal as an external facing portal.

The scenario is LB-> Apache-> SAP Portal-> SRM

I am terminating the SSL on the LB itself and the rest of the backend applications are accessed via http.

Most of the applications are accessed using the ReWrite Rules in Apache, but the Technical RFx is not giving a pop-up to open in a new window.On the contrary, the same set up without the certificate on the LB, the scenario on http works fine.
This is a copy of the http.conf file I am using. Could you please guide, if I am missing something?

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